

If you are no longer able to manually disable iMessage on the iPhone for whatever reason, the next option is to use the official de-registration service offered from Apple. Deactivate & Deregister iMessage Using the Phone Number & Web Form Of course, if you no longer have the iPhone, or maybe it took an extended bath and is no longer functioning, this is not an option, which means you’ll have to go another route. This can be done in Settings on the phone, and disabling iMessage can be done in a few seconds. Perhaps the easiest way to handle this is to simply turn off iMessage on the iPhone while it’s still active, before switching out SIM cards or switching service through a CDMA provider. If the iPhone is still active, simply turn off iMessage to detach the number and deregister iMessage We’ll walk through the two methods that are available to deregister iMessage and deactivate it from an iPhone and associated phone number, thereby detaching iMessage from the number. If you don’t deactivate iMessage from the phone number this way, you may lose some inbound text messages on the new phone that have been sent from other iMessage users.

If you ever plan on switching from an iPhone to another phone, even if for a temporary period of time, this should be high on your to-do list, right along with exporting contacts into a compatible format and saving other personal details. 2 Ways to Deregister iMessage from iPhone
